Yahoo Protocol 15 Login

Sanjay Raghani sanjay.raghani at
Tue Jul 1 04:36:49 EDT 2008


During the login sequence, Yahoo 8 (YMSG 15) client contacts the server It obtains token from the server on this connection and
later sends it to the yahoo server on port 5050.

Some user documented it in detail at the following link

In the login traces of Yahoo 8 client i could see it establishing a
connection with (it goes over SSL) but pidgin client doesnt
establish connection with

Sanjay Raghani

On Tue, Jul 1, 2008 at 1:39 PM, Sulabh Mahajan < at> wrote:

> Yahoo Messenger 9 uses YMSG 16, we don't support the login sequence it
> uses. I will be working on it, after my GSoC project is over, if no one else
> does it by then. :)
> Sooner or later version 16 login process will be done.
> Pidgin uses the same login process as yahoo 8.1, we still support old login
> process, though I don't think its used anymore.
> We can also use web messenger login type, though its turned off by default.
> Can you tell me what difference you found in the login process of pidgin
> and yahoo 8.1.
> Depending upon your firewall settings and connection preferences, YMSG data
> might be sent to one of several ports yahoo server supports, like HTTP, even
> telnet.
> This might change the way the login process appears on a packet sniffer,
> like wireshark doesn't recognize the data as YMSG when sent to port 23.
> We only send to port 5050.
> Sulabh
> 2008/7/1 Sanjay Raghani <sanjay.raghani at>:
>> Hi,
>> Pidgin 2.4.2 client implements Yahoo Protocol Version 15 (Yahoo
>> client). However the login protocol used by Pidigin is different than that
>> used by Yahoo 8.1 clients. Pidgin 2.4.2 seem to be using older login
>> protocol.
>> Please correct me if it is not the case.
>> Further i would like to know that is there some work currently being done
>> to implement/support the newer login protocol of for Yahoo?
>> Also the newer Yahoo 9 version (which is still in beta) has different
>> login sequence in comparison to even the Yahoo 8 (version 15).
>> Regards
>> Sanjay
>> _______________________________________________
>> Devel mailing list
>> Devel at
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